Pompey began the new campaign by collecting a point in a see-saw contest at Sheffield Wednesday.
Danny Cowley's side fell behind to Marvin Johnson's early finish, but Connor Ogilvie headed them back on level terms shortly after the interval.
Fisayo Dele-Bashiru hit back for the hosts, with Michael Jacobs and Colby Bishop then giving the Blues the upper hand.
A fine strike from Dele-Bashiru ultimately ensured the spoils would be shared, while Lee Gregory was dismissed for the Owls late on.
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